Swing设计JDialog

类别:Java 点击:0 评论:0 推荐:
 在Java Swing编程中,程序员还可以自定义对话框,一般可以从JDialog类来继承。下面给出一个对话框类的代码:



class HelpAbout extends JDialog implements ActionListener
{
 JavaWord mainFrame;
 JButton okButton;
 javax.swing.Timer myTimer;
 int Counter=0;
 public HelpAbout(JavaWord mainFrame)
 {
  super(mainFrame,"关于本程序的说明",true); //true 代表为有模式对话框
  this.mainFrame= mainFrame;
  JPanel contentPanel=new JPanel();
  contentPanel.setLayout(new BorderLayout());
  JLabel imageLabel=new JLabel(new ImageIcon(".\\images\\javalogo.gif"));
  contentPanel.add(imageLabel,BorderLayout.WEST);

  JPanel authorInfoPane=new JPanel();
  authorInfoPane.setLayout(new GridLayout(1,1));
  JTextArea aboutContent=new JTextArea("本程序是作者在学习Java2 Swing编程的一个简单的程序,\n并不作为商业目的使用。");
  aboutContent.enable(false);
  authorInfoPane.add(aboutContent);
  contentPanel.add(authorInfoPane,BorderLayout.NORTH);

  JPanel sysInfoPane=new JPanel();
  sysInfoPane.setLayout(new GridLayout(5,1));
  sysInfoPane.setBorder(BorderFactory.createLoweredBevelBorder());
  contentPanel.add(sysInfoPane,BorderLayout.CENTER);
  JLabel userName=new JLabel("本机的用户名为:"+System.getProperty("user.name"));
  JLabel osName=new JLabel("本机的操作系统是:"+System.getProperty("os.name"));
  JLabel javaVersion=new JLabel("本机中所安装的Java SDK的版本号是:"+System.getProperty("java.version"));
  JLabel totalMemory=new JLabel("本机中Java虚拟机所可能使用的总内存数:"+Runtime.getRuntime().totalMemory()+"字节数" );
  JLabel freeMemory=new JLabel("本机中Java虚拟机所剩余的内存数?quot;+Runtime.getRuntime().freeMemory()+"字节数" );

  sysInfoPane.add(userName);
  sysInfoPane.add(osName);
  sysInfoPane.add(javaVersion);
  sysInfoPane.add(totalMemory);
  sysInfoPane.add(freeMemory);

  JPanel OKPane=new JPanel();
  okButton=new JButton("确定(O)",new ImageIcon(".\\images\\ok.gif"));
  okButton.setMnemonic('O'); //设置快捷键为"Alt + O"
  /*以下代码是设置案钮的Rollover图象*/
  Icon rollover = new ImageIcon(".\\images\\exit.gif");
  Icon general = new ImageIcon(".\\images\\ok.gif");
  Icon press = new ImageIcon(".\\images\\help.gif");

  okButton.setRolloverEnabled(true);
  okButton.setIcon(general); //设置离开时的图象
  okButton.setRolloverIcon(rollover); //设置在按纽上时的图象
  okButton.setPressedIcon(press); //设置在按下按纽时的图象
  this.getRootPane().setDefaultButton(okButton); //设置该按钮为该对话框的默认的按钮?.

  okButton.addActionListener(this);
  OKPane.add(okButton);
  contentPanel.add("South",OKPane);

  setContentPane(contentPanel);
  // this.setResizable(false); //设置对话框为不可改变大小
  myTimer=new javax.swing.Timer(1000,this);
  myTimer.start();
 }

 public void actionPerformed(ActionEvent parm1)
 {
  // TODO: Add your code here
  if(parm1.getSource()==okButton)
  {
   dispose();
  }
  else if(parm1.getSource()==myTimer)
  {
   Counter++;
   this.setTitle("当前的定时器的值为:"+Counter+"秒");

  }
 }
}


  在事件响应代码中显示出该对话框,其程序代码如下:

HelpAbout aboutDialog=new HelpAbout(this);
aboutDialog.setSize(500,500);
aboutDialog.show();

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